Concentration and language skills don’t change much with age. The ability to store and retrieve information declines slightly but steadilty from the 20s on.
By age 50, lifelong thickening of the lens causes a noticeable loss of night vision and close-in focus.
After 20, the heart becomes less adept at accelerating in response to exertion. Bars show maximum rate in beats per minute.
As the body’s ability to deliver oxygen declines, the capacity for physical work falls. The work capacity of a 70-year-old is only half that of a 20-year-old.
Between the ages of 25 and 75 the amount of fat in proportion to the body’s composition doubles Much of that growth occurs in muscles and organs..
Many men experience a slight loss of upward mobility from 30 to 50, and a major loss from 50 to 70. Preventable vascular disease is largely to blame.
Eventually muscles get smaller and weaker, but those changes can be offset by exercise. Bone loss, a universal aging trait, occurs at individual rates.
Decline in sex drive varies from man to man, but some reduction is inevitable due to lower levels of sex hormones and loss of vitality.
Chest wall stiffens, increasing the workload of respiratory muscles. More residual air is left in lungs after each breath.
Eardrums thicken and the ear canal atrophies, making pure tones and high frequencies harder to hear, especially the late 50s.
The number of hair follicles on the scalp decreases as men age, and the hair that is left grows at a slower rate.
Maximum heart rate in beats per minute: Age Beats 20 200 30 190 40 180 50 170 60 160 70 150 Angle of erection: Age Degrees 30 20 20 10 40 1 50 -1 70 -25 Frequency of sex; orgasms per year: Age Number 20 104 30 121 40 84 50 52 60 35 70 22
